from datetime import datetime, timezone
from dulwich import porcelain
from dulwich.repo import MemoryRepo
from fastapi import FastAPI
from fastapi.responses import JSONResponse
import json
import uuid

class SCIMResponse(JSONResponse):
    media_type = "application/scim+json"

#Clone repo into memory
local_repo = MemoryRepo()
local_repo.refs.set_symbolic_ref(b"HEAD", b"refs/heads/main")
fetch_result = porcelain.fetch(local_repo, "ssh://git@platform.sunet.se:22022/mifr/scim-source.git")
local_repo.refs[b"refs/heads/main"] = fetch_result.refs[b"refs/heads/main"]
last_tree = local_repo[local_repo[b"HEAD"].tree]

app = FastAPI(default_response_class=SCIMResponse)

def list_below(store, treeid, base):
    for name, mode, sha in store[treeid.id].iteritems():
        if not base:
            base = b""
        if name == base:
            for name, mode, sha in store[sha].iteritems():
                yield name, mode, sha 
            
@app.get("/")
def read_root():
    return {"Hello": "World"}

@app.get("/v2/Users")
def read_all_user():
    all_entries = list(list_below(local_repo, last_tree, b'Users'))
    response = {}
    response["schemas"] = ("urn:ietf:params:scim:api:messages:2.0:ListResponse")
    response["totalResults"] = len(all_entries)
    response['Resources'] = []
    for entry in all_entries:
        response['Resources'].append(read_user(entry[0].split(b'.json')[0].decode('utf-8')))
    return response

@app.get("/v2/Users/{item_id}")
def read_user(item_id: uuid.UUID):
    try:
        path = f"Users/{item_id}.json"
        blob = porcelain.get_object_by_path(local_repo, path, None)        
        user = json.loads(blob.data)
        commits = [w.commit for w in local_repo.get_walker(paths=[path.encode()])]
        #import pdb;pdb.set_trace()
        last_mod = commits[0].author_time
        created = commits[-1].author_time
        user['meta'] = {}
        user['meta']['resourceType'] = 'User'
        user['meta']['version'] = commits[0].sha().hexdigest()
        user['meta']['created'] = datetime.fromtimestamp(created , tz=timezone.utc).isoformat()
        user['meta']['lastModified'] = datetime.fromtimestamp(last_mod, tz=timezone.utc).isoformat()
        user['meta']['location'] = "https://example.com/v2/Users/b181c1ec-46a9-40e1-965d-c6c78de47cb9"
        return user
    except KeyError:
        return("Panic, no file found. ")